Snubber for resilient mounting



- Patentedlleb. p

' ori-*len simultanv Fon ausma- MouN'nNo Herbert n. rink, ama, om.signor ai 'rhs B. F. Goodrich Company, New York, N. Y., a

corporation of New York applicauonmaren zo, 194s, serial No. 479,901 y iThis invention relates to vibration insulation and is especially usefulin the resilient supporting of instruments and machines. Moreparticularly.

the invention provides an improved snubber andv improved snubbing'action to cushion and limit springing deflection and to provide forvarying the rate of the deection, where desired;

The princi if I to provide enectivelyV for resilient cushioningthroughout a desired range of deilection and increased resisten togreater deflection; to provide for eiiective ubbing to prevent excessivedeflection; to pro e for variable rate deflection; to provide for convently altering the rate and snubbing characteristics of the mounting; topro yvide for conveniently excha 'snubbers on the same mounting, toprevent any metal to metal contact, and to provide simplicity ofconstruction, reliability of operationand convenience of manufacture andassembly.4

These Aandlother objects will appear from the following description andthe accompanying draw.. e" I Of the drawing: Y

Fig. 1 is a plan View of a vibrationinsulator or resilient mountingconstructed ln accordance with' and embodying the invention.

Fig. 2 is a cross-section thereof, taken on line 2 2 of Fig. 1,supporting and supported struc-y tures being indicated in dot-and-dashlines.

Fig. 3 is a perspective view of one of the cush` ioning elements orsnubbers, parts being broken away.

Fig. i is a cross-sectional view, like Fig. 3, showing a modication,parts being broken away.

Fig. 5 is a side view partly'inusection showing another mo'diflcation,parts beingbroken away.

Fig. 6 is a view, like Fig. 5, showing a further modification. l

Fig. 7 is a sectional view showing still a further s modification of thesnubber.

In accordance with the invention, referring first to the embodimentshown in Figs. 1 to 3, an instrument or machine to be supported from asupporting structure such as the frame l0,hav ing an aperture iitherethrough, is provided with a post I2 having a portion I3 of reduceddiameter extending from a shoulder I4 and terminating in a threadedportion`l5 engaged by a re taining nut I6 and washer I1.

For supporting the pest I2 from the frame I0 resiliently againstvibration, a spool-like supported member having a neck or tubular sleeve2li is provided to slip over the reduced portion I3 of the post, asupporting member 2| -is provided surrounding the sleeve, and a cushionbody rz claims. (ci. 24a-srs) objects of' the invention are y '2 22 ofvulcanized soft rubber. or other rubber-like material is providedbetween the sleeve and the supporting member and secured theretopreferably by a vulcanized bond.

'I'he supporting member 2l is preferably circular although a polygnalmember may be einployed if desired, and is preferably of L-shape incross-section with the cushion body secured to theinner vertical leg ofthe frame. The sleeve is preferably cylindrical with the cushion bodysecured to its vertical outer surface so that the load is supported bythe' cushion' body principally or entirely in shear stress. The cushionbody is preferably of annular `circular-forni with -oppositely directedconical top and bottom surfaces so thatits thickness increasesprogressively from the outer member 2l toward theinner member 20. Thesesurfaces may, however', be` curved in cross-section if desired toprovide any desired `having an aperture 26 adapted to receive the reYduced portion It of the post, is provided at the upper end of the sleeve20, andy may be made separately and -secured thereto as by welding,

brazlng', soldering or other fastening means, or l it may be held inplace inthe manner of a washer.

Its periphery is preferably greater than the opening of the supportingmember 2l and a cushioning or snubber element preferably formed as aring 21 of resilient soft vulcanized rubber or other rubber-likematerial is secured about its periphery so as to provide an annulardownwardly extending cushion 28 over the supporting member 2| andadapted to engage the member upon suiiicient depression of the post I2.

For conveniently attaching the'cushion 2:8 tov the disc 25 without itsextending above and occupying space unnecessarily over the upper face ofthe disc, and. also to strengthen the rim of disc.. enabling the ring 21to be snapped over the l the disc, the peripheral margin 30 of the'discis Y oset downwardly and the cushioning ring 21 is formed with an'annular groove or recess 3l units inner periphery for receiving themargin of the Aforces, as in' rebound, a spool-end in the form of a disc3,5 similar to the spool-end or disc 25 is mounted lon the post I2 atthe lower end of the sleeve 20 and has an upwardly offset margin 36. Acushioning or snubbing ring 31 of soft vulcanized rubber or otherrubber-like material,

similar to ring 21 is secured about the periphery of disc`35 and has aconvex cushioning portion 38 adapted to engage the lower side of thesupporting member 2l when the post I2 is moved' upwardly a sufficient`distance from itsl normal position but is .normally spaced therefrom.The disc 35 may be mounted or held 'in place in the same manner as thedisc 25.

In use, the supporting member 2I may .be

secured to its supporting structure I as by` screws or rivets, the postI2 is inserted through the sleeve 20 and secured to the vibrationinsulator by the nut I6. The insulator supports the load without contactof the cushioning rings 21, .3 1 with` the supporting member 2| undernormal vibrational and static loads. Upon increased downward deflection,the cushion ring isy lcontacted by the member 2l and supports a portionof the load under copression, the resistance to deflection lincreasingrapidly but progressively as the convex cushion of the ring is loaded.Sim-- ilarly, any extensive rebound or upwardly directed force causescontact of the cushion ring 31 with the supporting member 2l whichprovides rapidly but progressively increasing resistance to deflection;

In the modification of Fig. 4, the tubular sleeve 40, supporting member4I, disc 42, and resilient shear cushioning body 43 are similar to thesleeve 20, supporting member 2l, disc 25, andresilient body 22 of thevibration insulator of Figs. 1 and 2. The resilient compressible ringdesired and this may be accomplished by brass plating the metal disc andmolding and vulcanizing the cushion thereto, or by the use of adhesivecements.

The embodiments of Figs. l to 6, wherein the snubber is such that it canbe simply snapped in place and be easily removed, has the advantages offacilitating selection, -change or removal -of the snubber where it isdesired to alter the action of the mounting.

While the metal discs have been shown in Figs. l to 6 as welded to-thesleeve members, the weldingmay be 4omitted and the discsheld `in properrelation to the sleeve members by the post I2 and nut I6 in the mannerfor example of washers. To facilitate molding of'the shear cushioningbody it may be molded to thev frame 44, however, has a narrow lip 45extending downwardly from its annular cushioning portion 46 to contactthe supporting member 4I in vadvance oi the wider body of the cushioningelement and oiers less initial'resistance to compressive dis- Figs. l to4. 'Ihe resilient compressible ring 53,-

however, has a body portion 54 subject to compression, andan angularlydisposed lip 55 integral therewith and extending therefrom outwardly.The outer wall of the lip may have a groove 56 to reduce stillness. Inthis form of the invention, the load is carried by the body 51 acting inshear stress until the lip 55 engages the member 5I. Thereafter the lipis deflected by bending and consequent circumferential stretch of thelip until the groove 56 is closed, whereupon the body 54 of the ringwith the flattened lip is subjected to compressive distortion.

The form of the invention shownin Fig. 6 is similar to that of Fig. 5except that the lip 6Iiy turns inwardly and in use is subjected tocombined bending and consequent circumferential compression forprogressively increased resistance to deflection.

In Fig. 7 the cushioning ring 65 is bonded tof a. margin of the disc 66and no oiset of the margin is provided. Any of the cushioning ringsshown may be bonded to their metal discs if and sleeve member before themetal discs are Y,

secured to the sleeve member.

Variationsv may be made without departing from the scopeI of theinvention as it is..defined l by the following claims.

' I claim:

l. A. resilient mounting comprising relatively movable supporting andsupported structures, a resilient cushioning element connecting saidstructures, one of the structures including a plate element inoppositionto ,the other structure, and a snubber of resilientyrubber-like material at the margin oi the plate elementspaced in thedirection of movement from the other structure in a position to engagethe other structure at a determinate place in the `yrange of deflectionof the mounting.

2.A resilient mounting comprising relatively movable supporting andsupported structures, a resilient cushioning element connecting saidvstructures, one of the structures including a plate element inopposition to the other structure, and a' snubber of resilientrubber-like material at the margin of the plate element and.compris inga `bendable lip in a position to engage the other structure at adeterminate place in the range of deection of the mounting.

3. A resilient mounting comprising relatively movable supporting andsupported structures, av resilient cushioning'v element connecting saidstructures, one of the structures including a plate element inopposition to the other structure, and an annular snubber of resilientrubber-like ma- .terial at the margin of the plate element spaced' inthe direction of movement from the other structure in a position toengage the other structure at a determinate place in theJ range ofdeflection of the mounting.

4.1A resilient mounting as defined in claim 3 in which said plateelement has a depressed margin and said snubber is seated in thedepression.

5. A resilient mounting comprising relatively movable supporting andsupported structures, a

resilient cushioning element connecting, saidmovable'supporting andsupported structures,` a

ture, and an annglar snubber of resilient rubdeterminate place in therange of deflection of the mounting, said snubber having an annulargroove for receiving the margin oi a plate elenient and a cushioningobliquely toward the other structure.

8. A resilient mounting comprisingrelatively movable supporting andsupported structures, a resilient cushioning element connecting saidstructures, one of the structures including a plate element inopposition to the other struc- Iture, an annular snubber of resilientrubber-like material at the margin of the plate element in a position toengage the l'other structure at a determinate place in the range ofdeilection of the mounting, said snubber having an annularA groove forreceiving the margin of a plate element to hold the snubber in place byresiliently gripping said margin, and a cushioning portion in the formof a bendable annular lip extending toward the other structure. Y

9. A snubber for a resilient mounting in` which relatively movablesupporting and supported structures are connected by a resilientbody'and one of the structures includes a plate element .in oppositionto the other structure, said snubber comprising a bodyof resilientrubber-like material having a recess for receiving a margin of saidplate element and having a cushioning portion extending portion forsnubbing action upon engagement with the other o! said structures.

l0. A snubber for a resilient mounting in which relatively movablesupporting and` supported structures are connected by a resilient bodyand one of the structures includes a plate element in opposition to theother structure, said snubber comprising an annular body of resilientrubber-like material for embracing said plate element about its marginand having a cushioning portion for snubbing action upon engagement withthe other of said structures.

l1. A snubber for a resilient mounting in which relatively movablesupporting and supported structures are connected by a resilient bodyand one of the structures includes a plate element in opposition to theother structure, said snubber comprising an annular body of resilientrubber-like material for embracing said plate element about its marginand having an annular groove for receiving said margin and a cushioningportion for snubbing action upon engagement with the other of' saidstructures.

12. A snubbeifor a resilient mounting in which relatively movablesupporting 4and supported structures are connected by a resilient bodyand one of the structures includes a plate element in opposition to theother structure, saidl snubber comprising a body ot resilientrubber-like material for mounting on said plate element and having anangularly extending bendable cushioning portion for engagement with theother of said structures.

( HERBERT H. FINK.

REFERENCES crra'n The following references arevof record inthe CountryDate German June 29, 1938 Number

